She then returned to the United States East Coast for deployment with Destroyer Detachment, U. S. Naval Forces in European Waters.

There she served in a quasi-diplomatic capacity in the eastern Mediterranean until the spring of 1924, after successful negotiations for a peace treaty between the Allies and Turkey.

The entry of the U.S. into the worldwide conflict brought only an increase in antisubmarine activities for the destroyer as she continued her voyages to Iceland and across the Atlantic.

Upon her return to Boston, 1 October, she spent 3 months in convoy and patrol operations off the U.S. East Coast and in the Caribbean before shifting back to the Casablanca run in January 1945.

On 31 March, McCormick departed Norfolk for temporary duty with SubRon 3 at Balboa, Panama Canal Zone.

Her name was struck from the Navy list 24 October 1945 and her hulk was sold for scrapping to Boston Metals Company, Baltimore, Maryland, 15 December 1946.